Francis tanner



(No Model.)

F. TANNER. ELECTRICAL ANNUNGIATGB..

Patented Nov. 21, 1882.

fnv-enz/ francznnerf or other electrical conducting material.

tain new and useful improvements in the con-v in g the device that the index is held in posi- UNITED STATES PATENT OFFICE.

FRANCIS TANNER, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO JAMES ALLEN AND MICHAEL MCNAMARA, OF SAME PLACE.

SPECIFICATION forming part` of Letters Patent No. 267,807, dated November 21, 1882.A

l Application tiled August 10, 1882. (No model.) i i To all whom t may concern Be it known that I, FRANCIS TANNER, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Electric Anuunciators; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification. A

The nature of this invention relates to cerstruction and operation of annunciators, such as are ordinarily employed in hotels, which are actuated by battery or electric currents.`

The invention consists, first, in so constructing the device that the index is actuated by a change in the polarity of an electro-magnetwhich is actuated between two polesl of a permanent magnet, the whole being brought into operation the moment the circuit is complete by touching the contact or button in the room making the signal; and, second,in so constructtion by the attraction between the north and south poles of the electro and permanent magnet; also, in the peculiar construction, combination and operation of the parts, as more fully hereinafter described. v

Figure 1 is a front elevation of a section of my annunciator, showing the index pointing to the number of the room with which it is connected, and in dotted lines the position of said index when not in active use. Fig. 2`is a rear perspective, with a portion of the covering of the electro-magnet broken out.

In the accoinpanyin g drawings, which form a part of this specification, A represents the front of the annunciator, which is made up of as many sections as the number ot' rooms with which it is desired to make connection, and for each one of these sections there is provided an index, D, secured to the trunnion B of the electro-magnet E, which projects through the front of the annunciator, and the other trunnion, B', is supported in the bracket C, which is secured to the rear face of the annunciatorfrontL` This bracket should be made ot' brass H is a permanent magnet of the U or horseshoe form, and this is centrallysecured to the rear side of the annunciator-front, and the metal trunnion, which supports the index, passes through the center of this permanent magnet and is not insulated therefrom, but so arranged that they are at all times in electrical contact.

E is a wooden case, inclosing an electro-- magnet with a soft-iron core, and constructed in the usual way. The trunnion upon which the index is supported forms'a connection with one end of the wire of the electric magnet, while the corresponding trunnion passes through the bracket and forms the bearing and connection at that end of the device. To prevent the pole of the electro-magnet from coming directly in apposition to the opposite pole of the permanent magnet a stop, a, is secured to the case of the electro-magnet, designed in the change of polarity of the same to impinge against the side ot' the bracketl the call is made the current passes through' the wire F to the bracket` with which it is in electrical connection, and it passes through the bracket, through the wire which is connected with the electro-magnet, through the latterto the return-wire G, and by this means and arrangement of parts an instant change is effected in the polarity of the electro-magnet, which reverses its original position, carrying the index withit, this index being so arranged with relation to the axis ot the said magnet as to point to the number of the room making the call. t

What I claim as my invention is 1. The combination of au electric magnet having centrally-located trunnions and a suitable indicator attached to an extended portion of one of said trunnions, and centrally pivtcd between the extremities of a xed permanent magnet and a curved bracket inclosing said fixed and pivoted magnets, and secured to a suitable frame or base, and a suitable pin or stop adapted to rest against said bracket and prevent direct opposition of the poles ofthe magnets, and suitable wires whereby the pivoted magnet is oscillated between the poles of the permanent magnet by the a1- ternate`reversal of the current passing therethrough, and the attraction and repulsion of the permanent magnet, substantially as set forth.

2. The combination of the curved txed bracket C and fixed permanent magnet H, and a suitable frame or base with an electromagnet provided with trunnions pii'oted respectively in the bracket and fixed magnet, the stop a, and a suitable indicator, D, secured to the trnnnions otthe electro-magnet, and operated bythe alternate reversal of a single current in the electro-magnet and the normal attraction ot' the permanent magnet, substantially as shown and described.

FRANCIS TANNER.

Witnesses:

H. S. SPRAGUE, A. BARTHEL. 

